Marlbrook Marl

The Marlbrook Marl is a geologic formation in Arkansas.^[1] It preserves fossils dating back to the Late Cretaceous period.

Marlbrook Marl
Stratigraphic range: Cretaceous
Type	Formation
Underlies	Saratoga Formation
Overlies	Annona Chalk
Thickness	50 to 220 feet [1]
Location
Region	Arkansas
Country	United States
Type section
Named by	Robert Thomas Hill[2]

Paleofauna

Ostracods

Alatacythere A. pondersana[3][4] Amphicytherura A. dubia[3][4] Bairdia[4] Bairdoppilata B. pondera[4] Brachycythere B. ledaforma[3][4] B. ovata[3][4] B. rhomboidalis[3][4] Bythocypris B. windhami[3][4] Clithrocytheridea C. fabaformis[3] Cythereis C. costatana[4] C. hannai[4]

Cytherella C. coryelli[4] C. navarroensis[4] C. scotti[4] Cytherelloidea C. austinensis[4] C. crafti[3][4] C. greenensis[4] C. spiralia[3] C. tollettensis[3] Cythereis C. communis[3] C. costatana[3] C. filicosta[3] C. pidgeoni[3] C. tuberculifera[3] C. verricula[3] Cytheropteron C. blakei[3] C. castorensis[4] C. harrisi[4]

Echinocythereis E. bartoni[3][4] Haplocytheridea H. bruceclarki[3][4] H. councilli[4] H. fabaformis[4] H. globosa[3] H. micropunctata[3] H. monmouthensis[4] H. plummeri[3][4] Krithe K. cushmani[3] K. swaini[4] Loxoconcha L. fletcheri[3][4] Monoceratina M. marssonitina[4] M. montuosa[4] M. pedata[3] M. prothroensis[4]

Morrowina[3] Neocythere N. (Neocythere) pseudoconcentrica[4] Orthonotacythere O. (Orthonotacythere) hannai[3][4] O. (Orthonotacythere) polita[3][4] Paracypris P. angusta[4] P. goodlandensis[4] Pterygocythere P. saratogana[3][4] Trachyleberis T. communis[4] T. pideoni[4] Veenia V. arachoides[3][4] V. ozanana[3][4] Xestoleberis X. opina[4]

Avians

• Hesperornis^[5]

See also

• Paleontology portal

• List of fossiliferous stratigraphic units in Arkansas
• Paleontology in Arkansas